Multijet torch construction



AugflZ., '1 l-ll. G. ll-lUGI-.iEjY l j 2,252,320 MULTIJETfToRc'HCONSTRUCTION I Filed Feb. 128., 1939 ATTORNEY tatente'd Aug. 12, 1941UNITED STATES PATENT OFFICE Howard G. Hughey,

Bloomiield, N. I., assigner to Air Reduction iCompany,

Incorporated, New

York, N.. Y., a corporation of `New York Application February 18, 1939,Serial No. 257,070

c claims. (ci. iss-27.41 Fig. 1 is a vertical view, partly in section,ci?

This invention relates to improvements in the construction ci Oxy-fuelgas torches which have a number o f oriilces supplied with gas from acommon distributing chamber.

In order to distribute the gas to the different orifices evenly and thusobtain flames of substantially the same of the jet passages,- it hasbeen proposed'that the distributing chamber be made with a cross`section that decreases as it extends away from the gas inlet passage.

The gas for all of the flames passes along the inlet end of thedistributing chamber.l Some of the gas flows from the 4chamber througheach of the'iet passages, however, so'that the volume of size andintensity trom allgas flowing in the distributing chamber just ahead ofthe last passage is only a fraction of `that which ilows through theinlet end of the chamber.- f In a Vten-llame tip, for example, the endportion of the distributing chamber that supplies gas to the last jetpassage only, has a gas flow equal to only ten per cent. o! the gas flowin the other end of the distributing passage. By making thecross-section of. the distributing chamber between successive Jetpassages substantially proportional to the volume of gas owing in thatpartl of the chamber, the velocity of the gas ilow in the chamber pasteach of the jet passages is equalized, withthe result that substantiallythe same static pressure head is obtained.

at each'passage and the gas discharged from each orifice is the same.

In its broadest aspects this invention has for its object the providingof an improved multipleflame torch,vbut a more specific object of theinvention is to provide a simpler and more economical torch constructionby which the desired change -in cross-section ofthe gasl distributingchamber is obtained.

In accordance. with one feature of this invention v the distributingchamber is made by closing a channel of uniform depth with of varyingthicknessthat causes the cross-section o! the chamber to changethroughout its length.

Another feature of the invention be pointed out as the hereof:

a .wall

. relates to the y construction of tapered distributing chambers.

a multi-jet torch embodying thisinvention.

Figs. 2 and 3 are bottom and end views, re-A spectively, of the torchshown in Fig. l. A Figs. 4 and 5 are sectional views on the lines 4-4and 5 5, respectively, of Fig. 1. i v

Fig. 6 is a vertical view, partly in section, showing a modiiled form ofthe invention for use in heating curved surfaces.

Fig. 'l is a fragmentary view showing aportion of the lace o'f the torchof Fig. 6.

, Figs. 8 and 9 are sectional views on the lines B--il and 9 9,respectively, of Fig. 6.'A

Fig. 10 is a vertical sectional view through another modified form ofthe invention.

Fig. 11 is a section on the line l|- I I of Fig. 10.

Figs. 1-5 show a heating tip comprising an elongated block 50 which ismade with a channel 5| in its bottom face. there is Aa longitudinal gaspassage 52 extending along the entire length of the block 50. The endsof the longitudinal gas passage 52 are closed `by plugs 53. A gas inletopening 55 through the top of the block 5licommunicates with thelongitudinal passage 52 midway betweenv the ends of the block. There isa connecting passage 58 near each end of the block, between thelongiinto the channel 5l along that these end walls of the chamber 51 beintegral parts of the insert 58.

and advantages of the The channel 5I has a shoulder 5| against which acorresponding shoulder on the insert 58 abuts.

The insert `58 is held in place by hard solder applied along the lines52 where the lfaces ol the insert 58 and block 50 come together. 'Theplugs 53 at the ends of the longitudinal gas passage 52 are preferablysoldered to the block 50 in the same/manner.

With the exception of its endportions 59, the

" insert sa doesnot completely mi any part of the channel 51 above theshoulder 6I, and the amount that the Vinsert 58 does extend into thatpart of fthe channel above the shoulder 6I varies along the length ofthe distributing chamber 51.

The insert 58 is a wall ol varying thickness, along one side of thechamber,51, that gives the vchamber diilerent Vcross-sectional areas atdifferent points along lits length.

Above the channel 5l Jet passages 64 extend through the insert 58. Thecross-section of the distributing chamber 5I is greatest at the ends oi'the chamber adjacent the end jet passages 64. As the chamber 51 extendsaway i'rom the connecting passages 58 throughwhtch gas is supplied tothe chamber, its cross-section decreases and reaches a minimum over thejet passages at the middle of the torch. 'I'he cross-section of thechamber is preferably proportional to the volume of gas flowing atdifferent regions along its length.

Figs. 6-9 show a modified form of the invention for heating convexcurved surfaces, and in the case of the torch illustrated, cylindricalsurfaces. The torch includes two block segments 68, each with a channel61 in its inside face. The

channels 61 are of uniform depth, and they are filled by a number oforifice blocks 68, there being three such blocks in the torch shown inFig. 6, so that the middle block 68 extends across the juncture of theblock segments 66, and holds the block segments together.

The parts are connected by hard solder. The orifice blocks areoriginally made with grooves in their side faces, and when the parts ofthe torch are first assembled, wires of hard solder 10 are inserted intothese groves and the torch heated sumciently to fuse the solder andcause it to adhere to the parts.

' A narrow'channel 1| cut in the middle wall of the channel'61 startsnear the lower end of each of the block segments 66 and increases indepth progressively until it reaches its maximum depth at themid-portion of the torch. When the orice blocks 5B are in place andconnected with the block segm"ents 66, they cover the narrow channels 1Iandrform with those channels a distributing chamber 13 whichprogressivelyl decreases in -cross-section as it extends away from acentral gas inlet passage 14. Gas discharges from the chamber 13 throughjet passages'15 in the orifice blocks 68.

' Figs. 10 and l1 show,a torch tip in which an elongated block 40 vhas alarge central recess closed by a cover plate 42 that has an insertextension 43 on its inside face. The insert extension 43 reaches to thefar side of the recess and divides the recess into a longitudinal gaspassage 44 and a distributing chamber 45.

The insert extension has a top surface parallel with the top wall of thecentral recess so that the cross-sectionof the longitudinal gas passage44 is uniform throughout the length of the passage 44. The bottomsurface of the insert 43 is not parallel with the lower wall of therecess, however, but is angular and slopes toward the center of thelower wall so that the gas distributing chamber 45 is o f minimumcross-section near its mid-portion and progressively increases in lcross-section toward both ends.

The insert extension 43 is shorter than the recess vin the torch blockand leaves a-clearance 46 at both ends through which gas flows from thepassage 44 to the ends of the chamber 45. Gas

.'ilows from the 'chamber 45 through jet passages 41 that open throughthe bottom face of the tip. The variation in the cross-sectional area is`preferably proportional to thefchange in the volume of gas flowing atthe diierent regions along the length of the chamber 45.

Several embodiments of the invention have been illustrated anddescribed, but the invention is not limited to these embodiments, andsome features of the invention may be used without others.

I claim:

1. In a heating torch comprising an elongated block tip in which is arecess open along a side extending lengthwise of the block, a covermember closing the open side of said recess and forming with said recessa gas distributing chamber, a plurality of jet passages opening intosaid chamber at spaced points along its length and through winch gasfrom said chamber is discharged through oricesin the face of the tip,and a gas inlet passage opening into'the distributing chamber, saidcover member having a portion of varying thickness along its -lengthlocated along a side of the chamber and reducing the open cross-sectionof the chamber progressively along the length of said chamber as thechamber extends away from the inlet passage. l

2. A heating torch comprising an elongated block having a channel in itsbottom face, a gas inlet leading into said channel, and walls closingthe ends and bottom of said channel to form a distributing chamber, thebottom wall comprising an insert that varies in thickness along itslength to reduce the cross-section of the distributing chamber as itextends away from the gas inlet, and iiame jet passages opening throughthe insert.

3. A heating torch including an elongated block with a recess in oneside and jet passage extending through the bottom wall of the recess andthe bottom face of the block, a gas inlet conduit opening into the topof the recess, a cover plate on the side of the blockclosing the recessand forming an enclosed space within the torch, and an extension on theinside face of the cover plate dividing the enclosed space into an upperlongitudinal gas passage into which said gas inlet conduit opens, and alower gas distributing chamber into which the jet passages open, saidextension terminating short of the ends of the recess, to leave theupper passage and lower chamber in communication.

4. A torch for heating curved surfaces, said torch including two arcuateblocks connected together to'form a continuous arc, channels in thefaces of said blocks, the channel in each block being of increased depthas it approaches the other block, a gas inlet conduit that supplies gasto both channels in the region where the blocks meet, and a plurality oforice blocks partially filling the channels and forming with saidchannels gas distributing chambers that decrease in cross-sectional areaas they extend away from the inlet conduit.

-` 5. An larcuate heating torch comprising two members including a blockwith a channel in its bottom face, and an insert tting within thechannel and forming with said channel a distributing chamber, one ofsaid members being of variable cross-section so that the walls of thedistributing chamber converge along the vlength of the chamber, a gassupply conduit sage through'which gas enters the chamber, and

the cross-sectionalarea of the chamber at each of. the jet passagesapproximately proportional to the' volume-of gas ilowingat thatpolnt,the improvement which comprises a. composite block tip includingtwo sections that are connected together and one of which includes arecess that i 2,252,32o I V3 forms. when-covered -by the other'section,Vthe parallelism so as Vto obtain the tapered crossl Section ot -saiddistributing chamber.

' --HQWARD G. HUGHEY.

